Categorizing people according to whether they voted yes or no on a particular issue is an example of a(n) ________ scale

The assumption that the environment affects dizygotic (DZ) twins in the same way it influences monozygotic (MZ) twins has been criticized. Describe this criticism and the research methodology used to address it

Need help with this one please!

In psychoanalysis, which component of personality is present at birth and is the reservoir of unconscious psychological energies and the motives to avoid pain and obtain pleasure?

a. Id b. Ego c. Libido d. Superego